Pressure-control valve



J. C. JOHNSON PRESSURE CONTROL VALVE Apr. 24, 1923.

Filed April 1'7 1922 /NVENTOR JESSE C, JOHNSON' v zo Patented Apr. 24, 1923.

1,452,560 OFFICE.

'JESSE C. JOHNSON, 'OF SAN FRANCISCO, CALIFORNIA,

PRESSURE-CONTROL VALVE.

Application led April 17, 1922. Serial N. 554,161.`

T'o all whom t may com-ern Be it known vthat I, JESSE C. JOHNSON, a citizen of the United States, residing at 1337 Mission Street, San Francisco, in the county of San Francisco and State `ofCalifornia, have invented certain new and usevful Improvements in al Pressure-Control Valve, of which the following is a specification.

This invention relates to an automatic oil pressure control valve for rotary burners, and especially to means for automatically varying the oil flow to the burnerias the fires are increased or decreased.

One of the objects o f the present invention is to provide a simple, substantial and easily installed regulator, which 1s actuated by variations of the oil under pressure delivered to thevburner.

Another object of this invention 1s to provide means actuated by the steam pressure of the boiler for automatically varyingthe oil under pressure delivered to the burner.

With these general objects 1n view and others that will appear as the nature of the invention is better understood, the same consists in the novel combination and arrangements of parts hereinafter fully described, illustrated in the accompanying drawings and then claimed.

In the drawings forming part of this application and in which like designatmg characters refer to corresponding parts throughout the several views:

Figure 1 is a front view of a boiler and furnace showing the application of the device; and

Fig. 2 is an enlarged sectional view of the pressure control valve.

Referring to the drawings in detall, indleating in general a boiler by 3 and the furnace front by 4. Suitably supported with relation to the said furnace front is an oil burner 5, the type of burner employed in the present invention being such as shown in my Letters Patent entitled Oil burner construction issued October 17, 1916, No. 1,201,999.

I will not herein in detail describe or claim the new burner element of my combination inasmuch the same per se, constitutes the subject of a co-pending application filed March 23, 1922, Serial No. 545,989.

A 4burner of this `character consists of a motor driven atomizer. The oil employed for combustion is delivered to the pumping `boiler proper is a piston 16,

system 6, by means of a pipe 7. A pipe 8 connected with the pumping system carries a pressure actuated control valve indicated as at A.- A pipe otherwise connected to the said pipe 8, `not here shown, delivers a predetermined quantity of oil to the rotary atomizer-by means of the constant pressure maintainedby the said pumping system with-in the said pipe 8.

This control valve A is connected with a pressure regulator 9, of suitable construction, on the steam..dome of the boiler, by means of a link.10, and: it serves the function of varying the oil pressure in the pipe 8 between the valve A and the atomizervof the burner proper.

This pressure control valve remains at normal as long as the steam pressure in the below a predetermined will, however, automatipoint. The valve generally cally open the moment a predetermined pressure prevails within the steam dome of the boiler, and acting in unison with the valve A, will open the samefby release of the valve stem sleeve, allowing of more oil to return to the source of supply, thus lowering vthe oil pressure withln the pipe 8, and reducing the quantity ofoil delivered to the burner.

TheA pressure control valve is constructed substantially as shown in Fig. 2. It consists of a valve casing 11, having suitable couplings l2 and 13, a bonnet 14 is threaded into the upper end of the said valve casing as at 15. A cylinder 16 is formed within the valve casing and integral therewith, the said cylinder casing part being flared on its upper edge as at 161 for reasons presently explained. A piston valve 16h, comprising having a frusto-conical upper part 16d and having a stem 17 is adapted to seat into and close the said cylinder casing part. Surrounding the stem is a coil spring 18. This coil spring is interposed between the flange 19, integral with the said stem and a sliding collarv20. Slidably mounted upon the valve stem 17 is a sleeve 21. This sleeve, surrounded by a packing gland 22, is slidably mounted into the upper end of the bonnet and extending exterior thereof, adjustmentis had by a set nut 23. An annular flange 24, integral with the said sleeve, positioned at its lower end, is provided to limit-the upward movement of the sleeve.

Arranged and seated below the adjustment nut 23, is a bearing bracket 25, secured to this part of the bonnet by means of a collar 26, integral with the -sad bracket and hav' a set screw 27 for adjustment. Pivota 1y mounted in the bearin bracket as at 28, ,is a lever 29, having its ort arm o ratively seating upon the upper end of di); sleeve 21. An ad1ustment bo t 31, preferably threaded into theaid bracket as at 32,having a set nut 33, 1s provided to limit the movement of the lever arm 30.

The .valve casing is divided into two chambers 34 and 35. The oil from the ng system' by means of p1pe8 enters puml the c amber 34 and it passes by the Plston -valve' 16" before it enters the chamber 35 and returns to the source of supply. A conl. stant quantity of fluid oilunder pressure is maintained -by .the cpumping system within the pipe 8 connecte to the control valve by coupling 12. Under normal conditions the 4- oil within 'the pipe 8, on reachin a predetermined` pressure will force the plston valve 16'* upwardly, thus allowing for an excess of. oil supplied to return through the chamber 35 to the source of supply by means of pi 8*.

ou'nted on the steam dome of the boiler is asuitable steam pressure regulator 9 having a. bearing bracket 36 and a lever 37 pivotally mounted therein. A link 10 forms a connection between the lever 37 and the lever 29, as at 29, of the control valve. The steam within the boiler, on reaching a predetermined pressure will lower the lever 37, this is in turn transmitted through the link 10 to the lever 29 and to the'valve stem sleeve 21. Release of the valve sleeve 21 by the lever arm causes the same to move up ward, thus decreasing the tension of the coil spring on the valve stem, thus released, the piston valve 16h will more readily respond to the pressure of the fluid oil within the -pipe 8 allowing of more of the oil to return to the source of supply. Lowering of the oil pressure within the pipe 8 will reduce the supply of oil to the burner thus also lowering the fires underneath the boiler.

From the foregoing description it may be seen that I have provided means actuated by the steam pressure of the boiler for varyin the amount of oil delivered to the burner. at I claim as new and desire to secure by Letters Patent is:

1. A control valve having a casing and a chamber therefor, a piston valve, a stem for the said valve having an annular iange integral therewith, a collar slidably mounted ,A on t e said stem, a coiled spring secured between the said flange and the said collar, normally urging the said valve stem downward to maintain the valve in its normal closed position, a sleeve slidably mounted on the said valve stem extending exterior of tion with a boiler, a source o'pressure, a` .control valve having a casing and a chamber therefor, said chamber being open to the said source, of a piston valve, a stem 'for the said valve having an annular ange integral therewith, a collar slidably mounted on the said stem. av coiled spring interposed between the said'flange and the said collar, normally urgin the valve stem downward to maintain tie valve in its normal closed position against the said pressure source, a sleeve slidably mounted on the said Valve stem el@ tending exterior of the said casing, of a bearing bracket carried by the said casing, a lever pivotally mounted into the said bracket adapted to actuate upon the said sleeve, a regulator carried by the boiler having a lever, means of connecting the said levers, said regulator? adapted to open when. the steam pressure within the boiler exceeds a predetermined point coacting in unison with the said control valve.

3. The combination with a boiler and furnace, of an oil burner for the furnace, a source of pressure, a pipe for delivering oil under pressure to the burner, a control valve on said pi e having a casing and `forming a chamber t erefor, said chamber being open to said source of pressure, a piston valve having a frusto-conical upper part, a stem for the said valve, having an annular flange integral therewith, a collar slidably mounted on said stem. a coiled spring interposed between the said flange and the said collar,

ythe said sleeve, means for adjusting the movement of said lever carried by said bear ing bracket, a regulator carried by the boiler and having a lever, means of connecting the said levers. said regulator adapted to open when the steam pressure .within the boiler exceeds a predetermined oint and cooperating with the said control) valve.

In testimony whereof I have aiiixed my signature in the presence of two witnesses.

JESSE C. JOHNSON.

Witnesses:

M. CHRIs'rENsEN, A. J. BRADLEY.

aoV 

